KR101288479B1 - Watertight structure of shaft housing in polyurethane butterfly valve - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a water-tight structure for preventing fluid from penetrating a body portion of a valve in which a shaft is inserted in a polyurethane-lined butterfly valve mounted on a water supply pipe, a sewer pipe, or the like, so that airtightness is maintained by a disk. .
SUMMARY OF THE INVENTION An object of the present invention is to provide a watertight structure of a bushing portion which does not affect the polyurethane lining process and a bush structure that does not affect the torque of the shaft while securing the watertightness of the axle portion of the polyurethane lining butterfly valve. It is for.
In the watertight housing watertight structure of the polyurethane butterfly valve of the present invention, the outer diameter groove 41 is formed on the outer surface of the distal end portion and the inner diameter groove 42 is formed on the inner surface thereof, and a plurality of inner portions are formed on the central portion of the inner surface. O-ring groove 45 is formed, the inner groove 46 is formed on the inner surface of the distal end in the opposite direction to the disk 20 and the cylindrical bush 40 of the metallic material formed with a protruding step 44 on the outer surface, the bush Insert the 40 into the housing 11 of the valve body 10, and the mold (50, 51, 52) is mounted to the valve body 10 to inject a polyurethane raw material in the liquid state of the bush 40 Starting from the distal inner surface inner groove 42, the polyurethane 70 is molded to be wrapped along one side of the bush 40 to the outer diameter groove 41 formed on the distal outer surface,
A plurality of O-rings 80 made of elastic material are inserted into the plurality of inner O-ring grooves 45 of the bush 40, and a plurality of O-rings 80 are inserted into the inner grooves 46 of the bush 40. It is possible to prevent fluid from penetrating into the housing 11 of the valve body 10 by blocking the fluid that penetrates to the outer and inner surfaces of the bush 40 by crimping with 60.
According to the present invention, there is an effect that the life of the valve can be extended by blocking the fluid penetration of the shaft portion of the butterfly valve lined with polyurethane to prevent corrosion of the shaft portion. In addition, by preventing the contamination of the fluid due to corrosion of the axial housing portion, there is an effect that the contamination of water can be prevented when the polyurethane lining butterfly valve to which the present invention is applied to the water supply pipe.

Description

Watertight structure of shaft housing in polyurethane butterfly valve}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a water-tight structure for preventing fluid from penetrating a body portion of a valve in which a shaft is inserted in a polyurethane-lined butterfly valve mounted on a water supply pipe, a sewer pipe, or the like, so that airtightness is maintained by a disk. . More specifically, the body is susceptible to corrosion by providing a polyurethane lining structure surrounding the inner and outer surfaces of the bush to prevent fluid from penetrating into the body portion into which the shaft of the butterfly valve lining the body is inserted. It relates to a watertight housing structure of a polyurethane butterfly valve that protects the interior from corrosion.

Butterfly valves installed in water pipes are classified into rubber seat butterfly valves, metal seat butterfly valves and polyurethane lining butterfly valves according to the type of seat. These butterfly valves control the fluid by the rotation of a circular or elliptical disk inside the body. A shaft is inserted for rotation of the disk, which is inserted through the body and the disk.

Most butterfly valves anticorrosive their surfaces to prevent corrosion by fluids. The inner surface of the body of the butterfly valve is the area where the fluid always touches, so it is thoroughly treated. In addition, the outer surface of the body that is not in contact with the fluid is subjected to anticorrosive treatment to prevent corrosion. The most susceptible to corrosion in the butterfly valve is the axle space where the shaft is inserted. The celebratory space is a part into which the shaft for supporting and driving the disk is inserted, which requires high precision, and thus it is difficult to perform separate method processing.

In order to protect the axle portion of the butterfly valve from corrosion, it is best to prevent fluid penetration. Each butterfly valve has a structure for blocking the penetration of the fluid, but in reality it is impossible to completely prevent the blocking of the fluid. This is because the shaft is delivered with a strong torque to drive the disk. When the fluid barrier property is increased, the torque of the shaft increases, and the O-rings inserted for the purpose of fluid blocking harden over time and do not function properly. .

The life of a butterfly valve depends on the environment in which it is used. Typically, 10 to 20 years of use will end the life of the valve. The main reason why the valve can not be repaired at this time is severe corrosion of the axle. That is, the main reason for determining the life of the butterfly valve is the corrosion of the enclosure portion, because it does not completely block the fluid penetrating into the enclosure portion.

Corrosion due to fluid infiltration of the shaft portion of the butterfly valve not only acts to shorten the life of the valve, but also causes contamination of the fluid. In particular, when the butterfly valve is connected to the water supply pipe, it becomes a great cause of contaminating the melted water quality due to the corrosion of the axial housing part.

SUMMARY OF THE INVENTION An object of the present invention is to provide a watertight structure that prevents fluid from penetrating into a housing portion of a body into which a shaft is inserted with respect to a butterfly valve in which a valve body is lined with polyurethane, which is a polymer compound. More specifically, to provide a watertight structure of the bushing part which does not affect the torque of the shaft and the bushing part which does not affect the torque of the shaft while securing the watertightness of the axle part of the polyurethane lining butterfly valve. will be.

The above object of the present invention can be achieved by the present invention described in detail below.

In the watertight housing watertight structure of the polyurethane butterfly valve of the present invention, the outer diameter groove 41 is formed on the outer surface of the distal end portion and the inner diameter groove 42 is formed on the inner surface thereof, and a plurality of inner portions are formed on the central portion of the inner surface. O-ring groove 45 is formed, the inner groove 46 is formed on the inner surface of the distal end in the opposite direction to the disk 20 and the cylindrical bush 40 of the metallic material formed with a protruding step 44 on the outer surface, the bush Insert the 40 into the housing 11 of the valve body 10, and the mold (50, 51, 52) is mounted to the valve body 10 to inject a polyurethane raw material in the liquid state of the bush 40 Starting from the distal inner surface inner groove 42, the polyurethane 70 is molded to be wrapped along one side of the bush 40 to the outer diameter groove 41 formed on the distal outer surface,

A plurality of O-rings 80 made of elastic material are inserted into the plurality of inner O-ring grooves 45 of the bush 40, and a plurality of O-rings 80 are inserted into the inner grooves 46 of the bush 40. It is possible to prevent fluid from penetrating into the housing 11 of the valve body 10 by blocking the fluid that penetrates to the outer and inner surfaces of the bush 40 by crimping with 60.

Hereinafter, the details of the present invention will be described in detail.

According to the present invention, there is an effect that the life of the valve can be extended by blocking the fluid penetration of the shaft portion of the butterfly valve lined with polyurethane to prevent corrosion of the shaft portion. In addition, by preventing the contamination of the fluid due to corrosion of the axial housing portion, there is an effect that the contamination of water can be prevented when the polyurethane lining butterfly valve to which the present invention is applied to the water supply pipe.

Fig. 1.Swing housing structure of a conventional rubber seat butterfly valve.
Figure 2. The enclosure structure of a conventional polyurethane butterfly valve.
Figure 3. Detail view of the watertight housing watertight structure of the existing polyurethane butterfly valve.
4. The watertight housing watertight structure of the polyurethane butterfly valve of the present invention.
5. Partial detail view of the watertight housing watertight structure of the polyurethane butterfly valve of the present invention.
6. (a) perspective view and (b) cutaway view of a bush included in the present invention.
Figure 7. Mold mounting for polyurethane lining to achieve the present invention.
8. Cutaway view of a polyurethane butterfly valve to which the present invention is applied.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a view showing the axial housing structure of the conventional rubber seat butterfly valve. The rubber seat butterfly valve is expressed as rubber sheet because the material of the seat blocking the fluid is rubber. Since this part is not included in the scope of the present invention, a detailed description thereof will be omitted. As shown in a partial enlarged view of FIG. 1, a cylindrical bush 40 made of bronze or brass is inserted into an inner surface of the body housing 11 of the body 10, and a shaft 30 made of a stainless steel is generally bushed. It is inserted through 40. The body 10 of the valve usually uses a ductile (Ducktile, GCD 450) and the material of the celebratory housing 11 is the same as the material of the body (10).

As shown, the penetration of fluid into the celebratory housing 11 begins at the point where the through-hole (not shown) portion of the body 10 and the outer surface of the shaft 30 come into contact with the shaft 30 through. . This part is also a part where the metal body 10 and the metal shaft 30 are in contact with each other, but since the shaft 30 rotates, there is no way to prevent the penetration of the fluid. As shown, the means for preventing the ingress of fluid into the enclosure 11 portion of the rubber seat butterfly valve is an O-ring 80. The O-ring 80 is inserted between the stepped portion of the body 10 and the bush 40, the O-ring 80 is pressed by the shaft cover 12 to maintain the watertightness.

In order to drive the valve, the disk 20 must be rotated and the shaft 30 must be rotated for this purpose. As time passes, the rubber O-ring 80 hardens or ages to change physical properties such as elastic force. Will lose its original functionality. In this case, once the fluid passes through the portion with the O-ring 80, there is no longer any means to shut off the fluid. This is because the celebratory housing 11, the bush 40, and the shaft 30 are all made of metal. When the fluid penetrates into the inner housing 11, the inner surface of the inner housing 11 of the ductile material, which is the most susceptible to corrosion, is rapidly corroded. The shaft 30 and the bush 40 are made of stainless steel and brass or bronze, which are resistant to corrosion, so that corrosion damage due to fluid penetration is not large.

Figure 2 is a shaft housing structure of the conventional polyurethane butterfly valve, Figure 3 is a view showing a detailed view of the shaft watertight structure of the conventional polyurethane butterfly valve. Polyurethane butterfly valve is a lining of a high-molecular compound polyurethane (70) to the inner surface of the body 10 to a certain thickness, the lined polyurethane (70) serves as a seat as well as preventing corrosion inside the body (10) Do this. As shown, the bush 40 has the same simple cylindrical structure as the conventional rubber seat butterfly valve, and the polyurethane 70 is formed by extension of the O-ring 80 of the conventional rubber seat butterfly valve. O-Ring That is, by forming the polyurethane 70 lining on the inner surface of the body 10 along the shaft 30 of the part of the housing 11 to prevent the fluid from penetrating into the part of the housing (11).

In addition, as shown in the drawing, a plurality of O-rings 80 are inserted into one side of the bush 40 in the opposite direction of the disk 20 to prevent the fluid penetration secondary. In the conventional watertight housing watertight structure of the polyurethane butterfly valve, the polyurethane 70, which is primarily formed into the watertight housing 11, blocks the fluid, and secondly, one side of the bush 40. A plurality of O-rings 80 inserted in the block the fluid. Therefore, the fluid blocking performance to the portion of the axial housing 11 is superior to the conventional rubber seat butterfly valve.

Although the polyurethane butterfly valve is superior in the fluid blocking performance of the enclosure 11 part compared to the rubber seat butterfly valve, it does not completely block the fluid penetration of the enclosure 11 part. Because, if the polyurethane 70 extended to the part of the housing (11) does not primarily block the fluid, the permeated fluid not only flows along the inner surface of the bush 40 but also outside the bush 40. It also flows to the side. As shown, the fluid penetrated between the left one side portion of the bush 40 and the polyurethane 70 begins to corrode the inner surface of the enclosure 11. When corrosion starts at this portion, corrosion is rapidly propagated to the inner surface portion of the frosted housing 11 which is in contact with the outer surface of the bush 40.

As a result, the corrosion of the portion of the shaft housing 11 of the conventional polyurethane lining butterfly valve starts at the inner surface of the shaft housing 11 at the portion where the bush 40 and the polyurethane 70 abut, It propagates to the inner surface portion of the celebrity 11 which is in contact with the outer surface and proceeds to the inner surface portion of the celebrity 11 having a plurality of O-rings 80 inserted into the right side of the bush 40. The reason for not preventing the first fluid penetration is that the bush 40 is inserted into the inner surface of the body 10 and then the bush 40 is inserted into the bush 40 and the polyurethane 70 in a simple crimping manner. Because it is in contact.

The pressing of the polyurethane 70 and the bush 40 for the primary blocking of the fluid is pressed by the presser 60, and a plurality of O-rings 80 are inserted between the presser 60 and the bush 40. That is, the plurality of O-rings 80 inserted for the secondary blocking of the fluid not only performs the function of blocking the fluid, but also transmits the force for compressing the bush 40 and the polyurethane 70. As time elapses, a plurality of O-rings 80 made of rubber material are hardened, thereby causing a problem in that the pressure of the presser 60 is not sufficiently transmitted to the bush 40. If so, the adhesion between the bush 40 and the polyurethane 70 is reduced and the fluid penetrates.

4 is a diagram showing a cutaway view and (b) a cutaway view in the watertight watertight structure of the polyurethane butterfly valve of the present invention, FIG. 5 is a watertight watertightness of the polyurethane butterfly valve of the present invention. It is a figure which shows the partial detailed view of a structure, and FIG. 6 is a figure which shows (a) perspective view and (b) cutaway view of the bush contained in this invention.

As shown in FIG. 6, the present invention has a complex shape in which the bush 40 has grooves and stepped portions formed on the inner side and the outer side instead of the general cylindrical shape. Bush 40 included in the present invention is generally cylindrical, the outer diameter groove 41 is formed at the distal end of the outer surface and the protruding step 44 is formed at the outer surface distal end facing the outer diameter groove 41 Outer O-ring groove 43 is formed in the side central portion. In addition, the inner surface of the inner diameter groove 42 is formed in the distal end portion in the direction of the disk 20, a plurality of inner o-ring grooves 45 are formed in the central portion of the inner surface and the inner surface end portion in the opposite direction of the disk 20 Inner groove 46 is formed in the.

Since a plurality of grooves and stepped portions formed in the bush 40 have different roles, the description of reference numerals is set to correspond to each function. Referring to the function of the grooves and stepped as follows. First, as shown in FIG. 5, the polyurethane 70 lining on the inner surface of the body 10 is lined to surround a portion of the bush 40 on the inner and outer surfaces. To this end, when lining the polyurethane 70 in the body 10 of the valve to which the present invention is applied, the bush 40 is inserted into the housing 11 and then the polyurethane 70 is lined. Lining of the polyurethane 70 is completed by fastening the mold to the body 10 and then injecting the polyurethane material in the liquid state into the mold to cure. This will be described in detail below. That is, the polyurethane raw material in the liquid state is cured to become a solid state. The bush 40 is first inserted into the housing 11, and then a part of the bush 40 is injected into the polyurethane 70 by injecting the raw material. It can be wrapped.

5 and 6, the protruding step 44 formed on one side of the bush 40 has to insert the bush 40 into the frosting 11 before injecting the polyurethane 70 raw material. The bush 40 performs a function of preventing further insertion of the bush 40 in the direction of the disk 20. That is, before injecting the polyurethane 70 raw material, the bush 40 is inserted until the protruding step 44 abuts against the step (not shown) formed in the shaft housing 11. In addition, the O-ring 80 is inserted into the outer O-ring groove 43 formed in the center portion of the outer surface of the bush 40, which is not used for blocking the fluid but when the bush 40 is inserted into the housing 11. To center the center of the (40) and the congratulation housing (11).

The portion where the polyurethane 70 abuts on the bush 40 is from the inner diameter groove 42 to the outer diameter groove 41 formed on the outer side along one side of the bush 40. The surface from the inner diameter groove 42 of the bush 40 to which the polyurethane 70 abuts to the outer diameter groove 41 is coated with an adhesive before injecting the polyurethane raw material. Therefore, while the polyurethane 70 is cured, the portion where the bush 40 and the polyurethane 70 contact each other maintains a strong adhesive force by the adhesive. This method and structure is a part that was not performed in the conventional polyurethane lining butterfly valve as the existing structure was the primary fluid blocking by the compression of the bush 40 and the polyurethane 70, the bush 40 And the polyurethane 70 are adhered along the inner and outer surfaces of the bush 40 to reliably perform primary fluid blocking.

As described above, the fluid penetrates between the outer surface of the bush 40 and the inner surface of the housing 11 by wrapping the inner and outer surfaces of the bush 40 in the direction of the disk 20 with the polyurethane 70. Can be prevented. This is to protect the inner surface of the axial housing 11, which is particularly susceptible to corrosion, and also to prevent the corrosion at the contact portion of the polyurethane 70 and the body 10. In the conventional polyurethane lining butterfly valve, the corrosion caused by the fluid penetrating into the turret housing 11 is also generated at the portion where the body 10 and the polyurethane 70 come into contact with each other, so that the adhesive force of the polyurethane 70 drops rapidly. Had a disadvantage. However, the present invention is able to sustain the adhesive force between the polyurethane 70 and the body 10 by blocking the fluid penetration into the portion where the body 10 and the polyurethane 70 abut.

As shown in FIG. 5, the portion where the shaft 30 and the polyurethane 70 contact each other serves to primarily block a fluid penetrating into the celebratory housing 11. However, as described above, the watertightness decreases due to the rotation of the shaft 30, so that perfect fluid blocking is impossible. The fluid passing through the contact between the shaft 30 and the polyurethane 70 does not flow toward the outer surface of the bush 40 as described above, and the portion where the inner surface of the bush 40 and the shaft 30 contact each other. Penetrates into. It is the O-rings 80 inserted into the plurality of inner O-ring grooves 45 to serve to block the fluid infiltrated secondary.

5 and 6, the O-rings 80 are respectively inserted into the plurality of inner O-ring grooves 45 formed in the central portion of the inner surface of the bush 40. As shown in FIG. The plurality of O-rings 80 are positioned between the bush 40 and the shaft 30 to perform secondary blocking of the fluid flowing along the inner surface of the bush 40. By inserting a plurality of the O-rings 80, it is possible to reliably perform secondary fluid blocking.

As shown, an inner groove 46 is formed on one side of the bush 40, and a plurality of O-rings 80 are inserted into the inner groove 46. The plurality of O-rings 80 inserted into the inner grooves 46 serve to shut off the fluid in a third way by pressing the presser 60 as shown in FIG. 4. The presser 60 is coupled by a celebratory housing 11 and a screw. The method and means for fixing the stopper 60 to the celebration housing 11 by using a screw fall under the spirit of the present invention and will not be described in detail.

That is, the present invention essentially blocks the fluid penetrating between the bush 40 and the inner housing 11 inner surface by the polyurethane 70 surrounding the inner and outer surfaces of the bush 40, the shaft 30 The fluid penetrating along the outer surface of the outer surface and the inner surface of the bush 40 is blocked at the contact portion of the primary elastic polyurethane 70 and the shaft 30, and secondly a plurality of inner o-ring grooves ( 45 is blocked by the O-ring 80 inserted in the third and is blocked by a plurality of O-rings 80 inserted into the inner groove 46 of the bush (40). As a result, the fluid flowing along the outer surface of the bush 40 is originally blocked, and the fluid flowing along the inner surface of the bush 40 is blocked first, second and third.

7 is a view showing a mold mounting for polyurethane lining for achieving the present invention. The polyurethane butterfly valve enclosure watertight structure of the present invention is not applicable to all of the general butterfly valves, but is a structure capable of only a polyurethane butterfly valve. The polyurethane butterfly valve is a valve in which the inner surface of the body 10 is lined with an elastic polyurethane 70 to line the polyurethane 70 using a mold. In the present invention, the bush 40 is first inserted, and then the process of forming the polyurethane 70 is briefly described as follows.

First, as shown in (a) of FIG. 7, the front mold 50, the rear mold 51, and the shaft portion mold 52 are coupled to the body 10. At this time, the bush 40 must first be inserted into the celebration housing 11 of the body 10. Before coupling the molds 50, 51, 52 to the body 10, a release agent is applied to the outer surface of the molds 50, 51, 52, and an adhesive is applied to the inner side of the body 10 and a part of the bush 40. Apply. Then, the polyurethane in a liquid state is injected through the polyurethane inlet formed in the front mold 50 and the back mold 51. Liquid polyurethane is filled as shown in Figure 7 (b) along the space formed by the surface of the mold (50, 51, 52) and the body 10 and the bush 40, the polyurethane over time (70) hardens and becomes a solid state. Then remove the mold to complete the lining of the polyurethane (70).

8 is a view showing a cutaway view of the polyurethane butterfly valve to which the present invention is applied. After the polyurethane 70 lining of the body 10 is completed by the above-described method, assembling the disc 20 and the shaft 30 and the like, the polyurethane lining butterfly valve as shown is completed. As shown in the figure, the structure of the left and right shaft 30 portions is slightly different, but since the essential portions of the present invention are the same, a description of the condensing housing watertight structure of the left portion is omitted.

10 ... body 11 ... celebration housing
12.Axle cover 20 ... Disc
30 ... axis 40 ... bush
41 Inner diameter groove 42 Inner diameter groove
43.Outer O-ring groove 44 ... Extrusion step
45 Inner O-ring groove 46 Inner groove
50 ... front mold 51 ... back mold
52 Shaft dies (52) 60 ... pusher
70 ... polyurethane 80 ... O-ring

Claims (5)

In the water-sealing structure of the polyurethane butterfly valve installed in the pipeline for conveying the fluid and consisting of a cylindrical body and a disc-shaped disk to control the flow of fluid by the rotation of the disk and lining the inner surface of the body with polyurethane,
An outer diameter groove 41 is formed on the outer side of the distal end, and an inner diameter groove 42 is formed on the inner side, and a cylindrical bush 40 formed of a metal material having a plurality of inner o-ring grooves 45 formed at the center portion of the inner side. );
The bush 40 is inserted into the shaft housing 11 of the valve body 10, and the molds 50, 51, and 52 are mounted on the valve body 10, and then the polyurethane material in the liquid state is injected to the bush ( Polyurethane (70) formed to wrap from the inner end of the inner end of the inner end of the distal end of the end portion (42) to the outer diameter groove (41) formed on the outer side of the distal end along one side of the bush (40); And
O-ring 80 of a plurality of elastic material is inserted into the plurality of inner O-ring groove 45 of the bush 40;
The watertight housing watertight structure of the polyurethane butterfly valve, characterized in that to block the fluid penetrating into the outer surface and the inner surface of the bush (40). The method of claim 1,
The bush 40 is a water-tight housing of the polyurethane butterfly valve, characterized in that the outer O-ring groove 43 is formed in the center portion of the outer surface to block the fluid penetrating into the outer surface and the inner surface of the bush 40 rescue. The method of claim 1,
The bush 40 has an inner groove 46 formed at a distal end of the disk 20, and a plurality of O-rings 80 pressed by the presser 60 are inserted into the inner groove 46 to insert the bush 40. The watertight housing watertight structure of the polyurethane butterfly valve, characterized in that to block the fluid penetrating the outer surface and the inner surface of the. The method of claim 1,
The bush 40 is a polyurethane butterfly valve, characterized in that the protruding step 44 is formed on the outer surface of the distal end in the opposite direction to the disk 20 to block the fluid penetrating the outer surface and the inner surface of the bush 40 Congratulations In the water-sealing structure of the polyurethane butterfly valve installed in the pipeline for conveying the fluid and consisting of a cylindrical body and a disc-shaped disk to control the flow of fluid by the rotation of the disk and lining the inner surface of the body with polyurethane,
The outer diameter groove 41 is formed on the outer side of the distal end, and the inner diameter groove 42 is formed on the inner side, and a plurality of inner o-ring grooves 45 are formed on the central portion of the inner side, and the distal end in the opposite direction to the disk 20. A cylindrical bush 40 formed of a metal material having an inner groove 46 formed on an inner side thereof and a protruding step 44 formed on an outer side thereof;
The bush 40 is inserted into the shaft housing 11 of the valve body 10, and the molds 50, 51, and 52 are mounted on the valve body 10, and then the polyurethane material in the liquid state is injected to the bush ( Polyurethane (70) formed to wrap from the inner end of the inner end of the inner end of the distal end of the end portion (42) to the outer diameter groove (41) formed on the outer side of the distal end along one side of the bush (40); And
O-ring 80 of a plurality of elastic material is inserted into the plurality of inner O-ring groove 45 of the bush 40;
O-ring 80 made of a plurality of elastic material is inserted into the inner groove 46 of the bush 40 and pressed by the presser 60;
The watertight housing watertight structure of the polyurethane butterfly valve, characterized in that to block the fluid penetrating into the outer surface and the inner surface of the bush (40).

Images